Re: [Boost-users] [parameters] Runtime enumeration of parameter list

From: Joel de Guzman (joel_at_[hidden])
Date: 2005-12-10 19:24:15

David Abrahams wrote:
> "Neil Hunt" <boost_at_[hidden]> writes:
> 
> 
>>I guess the main thrust of the question is "Does the parameters library 
>>support runtime enumeration?"
> 
> 
> Not directly, but it seems like something we (sh/c)ould support,
> probably by making ArgumentPacks conforming Fusion sequences so you
> could use boost/spirit/fusion/algorithm/for_each.hpp to enumerate them.
> The problem is that I don't have expertise with Fusion-1 and AFAIK it's not
> fully documented.  Specifically, I don't know how to make a conforming
> Fusion sequence.  Maybe Joel can help.  Joel?

Sure. I'll look into it. Should be a good example for the docs
in the making. I'm a bit hesitant to write this for Fusion-1,
however, as it will be replaced by Fusion-2 --which, BTW, has
a "map" that might be a good replacement for boost parameter's
internals. If boost.parameter uses fusion::map, then you
automatically have iteration support plus all the algorithms
etc. I bet fusion::map will simplify boost.parameter significantly
too.

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net